Malicious PDF — malware analysis report

Static analysis result for SHA-256 6940c874270fb95c…

MALICIOUS

PDF

103.0 KB Created: 2021-06-25 23:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f35f275e8e79d8b50f0346b2479f22f SHA-1: e934c413f97cc3edb0c600a1a11dd22efae16855 SHA-256: 6940c874270fb95cd6e39707e9ae3a0307e963d36d6c78730768e7f7d5405176
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress sites, many of which host other PDF files. This suggests a multi-stage attack where the initial PDF serves as a lure to redirect users to potentially malicious content hosted on compromised infrastructure. The ML classifier strongly indicates maliciousness, and the structure points towards a phishing or exploitation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc874d26fe---mitelemowizokimojabe.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7844b1a9---32293317543.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aba978b8e3b---10638986681.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160984206e4257---zejiparejedijome.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/10853555720.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabbab1a106---bupetakoge.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/mejodotoxagoxafomepewel.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/zufitubixilaladiteririlaj.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/11258283791.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a56107d86cf82127b32fc8ed66108e64/buzojejademenazaji.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/59824617060.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e49d06a6510933994b2695beae4e4eec/kosati.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607171828b407---rikijodedutaxizunovitafa.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/33492172914.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160748f2173c71---zamafulotemuwe.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dr7chq6ca3eg2jdlbrj7cu3cmh/xuminolelepetofut.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/jamilamonolumo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f6fa442ddc98e056619467e4c50e010c/5809559607.pdfIn PDF document text
    • https://geniodelweb.com/file/56547458019.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/88971419561.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b1b20d33396f7332f607da7fbdf00b4a/43983973440.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8f4a9e7efc35acefe1e7b9df203016f4/2424935583.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b07b910b65f3072f63ec9ceb0229b1ce/gesiduzet.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/37848097777.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/37c0522312ddc1898b9ced8946b03ed2/58577406506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=alpha+project+housingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2E 10864 bytes
SHA-256: 5986f476c7a4990460c2dfc596aceefe79bf850454a258e5c0c76f1f5e35744c
font_01_sfnt_off0001453d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453D 18808 bytes
SHA-256: 32369a682713db03f52cc4cb641a0df353a225133d027bf354255a551a119c74
font_02_sfnt_off000176a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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